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Unformatted text preview: January 23, 2008 ECE315 Assignment # 1 (Rev. 0) Spring 2008 Concepts: Semiconductors: Charge Carriers, Doping, Charge Motion (diffusion and drift) PN Junctions: Diode Models for IV characteristics (ideal,real, piecewise linear, small signal), Diode Circuits (rectifiers, wave shapers) Reading: Razavi Review Chapter 1 Semiconductors and pn Junctions Chapter 2 Diode Models & Circuits Chapter 3 Homework #1 Problems Due Friday Feb. 1 in class 1. Textbook Chapter 2, Problem 1. 2. Textbook Chapter 2, Problem 2. 3. Textbook Chapter 2, Problem 5. 4. Textbook Chapter 2, Problem 6. 5. Textbook Chapter 2, Problem 10. 6. Textbook Chapter 2, Problem 12. 7. Textbook Chapter 2, Problem 17. 8. Textbook Chapter 2, Problem 24. 9. Textbook Chapter 2, Problem 34. Modify circuit using R 1 = 1 k Ω. Also use the following model for the “real” diode in this circuit. I D = I S [exp( qV D ηkT )- 1] . with η = 1.8 and I s = 2 nA. 10. Textbook Chapter 3, Problem 10. Forget the plots, just derive voltage transfer charac- teristic. 11. Use a piece-wise linear diode model to plot the output waveform of series resistor diode circuit described in problem 9. Remember R 1 is 1 kΩ. Use a forward cut-in voltage of 0.67 volts and a diode series resistance of 1.67 Ω. Can you see the see the effect of the diode’s large signal resistance? Would a constant voltage model be adequate for his circuit? Why? . ECE315 January 23, 2008 Page 2 Lab Work: 1. Diodes & Diode Circuits Goals: 1. Learn how to perform automated IV data acquisition with SMUs. 2. Develop diode models for both large signal and small signal environments. 3. Obtain diode model parameters from measured data. 4. Examine a simple diode circuit with small signal and large signal ac stimulus. 5. Explore how the small signal circuit model is dependent on the DC bias of the diode. Preparation: • Carefully review this document and the lab notebook template (to be provided). • Establish an EE account so you can log in and transfer files. Alternatively you can use a USB memory stick to get data out of the lab. • Be sure to understand the analysis of the circuit to be built - its covered in HW problems 9 and 11 . • Examine the new lab bench. There are now 2 SMUs per bench - the upper instrument is at address 5 and the lower instrument is at address 7....
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- Spring '07
- Microelectronics, Diode Circuits, small signal, diode test circuit